Hmm, yes, doing it later would have it's advantages. You'd still have your
"unprocessed" version if you wanted to use that. And, in the studio, you'd
be able to "slide" the second recording relative to the first, allowing you
to adjust phase for optimal effect (thus reducing the effect of the 5"
separation mentioned earlier). And, furthermore, you could adjust the volume
of your second mike to optimize sound reduction. And all this could be done
"by ear", which is a very good way to optimize it all depending on what
you're trying to reduce or eliminate.
Hmmmm.
But would it be worth the hassle? And it would mean recording monaurally,
but using two channels.
Hmmm.
> Lang:
>
> Intriguing! If you recorded the two mics separately, as Left and Right
> channels, instead of hard-wired, you could still achieve the effect
> post-field by combining the sound channels in the editor, later, at
> adjustable phase and levels. Or, retrieve the original at-focus sound and
> use that alone, if certain effects were later deemed undesirable. Keep it up!
>
> Marty
>
> At 10:56 AM 2/11/02 -0500, Lang wrote:
>> I just did a second test in which I tried to greatly reduce or eliminate
>> "white noise" coming from behind the parabola (from a point source speaker).
>> I immediately realized that I get a much better result if the second,
>> polarity reversed mike is placed somewhere on the "inside" of the reflector,
>> so that it is receiving the same sound level (from the white noise) as the
>> main mike. I got good results by scrunching the head the the second mike
>> down to the bottom of the parabola, along the axis, well below the focal
>> point (= at the bottom of the dish).
>>
>> I also tested this arrangement using the on-axis playback of my bird song
>> and found the same 7db reduction in signal level when using the noise
>> cancelling mike.
>>
>> Encouraging! If this kind of setup allows for, let's conjecture, a 15-20 db
>> reduction in background hiss due to wind or stream noise as well as a nearly
>> complete elimination of distant rumble, while only reducing the on-axis bird
>> sound (or other animal sound) around 7 db, then this has definite
>> application, at least for parabolic-type recording.
>>
>> Lang
>
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